from manim import *


class CreateCircle(Scene):
    def construct(self):
        circle = Circle()  # create a circle
        circle.set_fill(PINK, opacity=0.5)  # set the color and transparency
        self.play(Create(circle))  # show the circle on screen


class nSum(Scene):
    def construct(self):
        hello = Tex("前k项奇数和", tex_template=TexTemplateLibrary.ctex)
        self.play(FadeIn(hello))
        self.remove(hello)